|3 Months Ended|
Mar. 31, 2022
|Share-based Payment Arrangement [Abstract]|
|Stock-Based Compensation||Stock-Based Compensation
There have been no material changes to the terms of our 2018 Equity Incentive Plan (the "2018 Plan"), 2018 Employee Stock Purchase Plan ("2018 ESPP") and 2009 Equity Incentive Plan ("2009 Plan") since the filing of our Annual Report on Form 10-K. Refer to Note 14, Stock-Based Compensation, in our Annual Report on Form 10-K filed with the SEC on April 7, 2022 for more information on our various equity incentive plans.
2018 Equity Incentive Plan
Shares of common stock reserved for issuance under the 2018 Plan also will include any shares of common stock subject to stock options, restricted stock units or similar awards granted under the 2009 Plan, that, on or after the adoption of the 2018 Plan, expire or otherwise terminate without having been exercised in full and shares of common stock issued pursuant to awards granted under the 2009 Plan that are forfeited to or repurchased by us. As of March 31, 2022, the maximum number of shares of common stock that may be added to the 2018 Plan pursuant to the foregoing is 897,229. Not including the maximum number of shares from the 2009 Plan that may be added to the 2018 Plan, the 2018 Plan had 3,550,935 and 762,038 shares of common stock reserved for future issuances as of March 31, 2022 and December 31, 2021, respectively.
Restricted Stock Units
A summary of our restricted stock unit activity under the 2018 Plan for the three months ended March 31, 2022 is set forth below:
During third quarter of 2021, we granted 50,000 stock options to a non-employee consultant at an exercise price of $1.08 per share. The stock options vest over one year in twelve equal monthly installments. As of March 31, 2022, the holder had not exercised this stock option and this is the only stock option grant outstanding under the 2018 Plan.
2018 Employee Stock Purchase Plan
We use a Black-Scholes option pricing model to determine the fair value of shares to be purchased under the 2018 ESPP. Stock-based compensation expense related to our 2018 ESPP for the three months ended March 31, 2022 was not significant. There were 1,008,039 and 189,215 shares of common stock available for sale and reserved for issuance as of March 31, 2022 and December 31, 2021, respectively.
2009 Equity Incentive Plan
A summary of our option activity under the 2009 Plan and related information is as follows:
For the three months ended March 31, 2022, the aggregate intrinsic value of options exercised was $42 and the total fair value of options vested was $12.
Compensation costs that have been included in our condensed consolidated statements of operations and comprehensive loss for all stock-based compensation arrangements is set forth below:
As of March 31, 2022, there was approximately $5,309, $283 and $3 of total unrecognized compensation cost related to the 2018 Plan, the 2018 ESPP and the 2009 Plan, respectively. These unrecognized compensation costs are expected to be recognized over an estimated weighted-average period of approximately 2.5 years, 1.3 years and 1 year for the 2018 Plan, the 2018 ESPP and 2009 Plan, respectively.
The entire disclosure for share-based payment arrangement.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef